Ascom – ATL Telecom AM2048 User Manual

Page 16

ascom

telecom

USER GUIDE

AM768A/AM2048A

Issue 8

4.6 Setting the Nx64K User Data Rate

For X.21 and V.35 the data rate may be set in increments of 64kbps. The default setting of N = 6. The
data rate is set by entering the desired value of N. The full range of N is from 1 to 32. The screen
display gives the equivalent data rate in kbps for the value of N. The software automatically restricts
the value of N to match the user interface and line interface combination. e.g. for an Am768, the
maximum value of N = 12.

For a G.703 to Nx64 configuration, the maximum value of N is 31 as only timeslots 1 to 31 are
transported over the transmission link. N may be further restricted depending on the transmission
system.

For software up to version 2.9, the value of N must be entered for each end of the link as follows:
At the master end:
Configuration>User Port

1. Set the desired value of N.
2. Press

, to select the remote end

3. Set the desired value of N
4. Press Enter to activate the change.

For software versions greater than 2.9, the value of N only needs to be set once:
At the master end:
Configuration>User Port

1. Set the desired value of N.
2. Press Enter to activate the change.

4.7 Selecting the Circuit Configuration

The term ‘digital section’ refers to the data link between the user ports of the connected DSLUs.
In a standalone section, the DSLUs provide the complete transmission system.
In a tandem section, the DSLUs are used to extend an existing circuit or network port. To achieve
synchronous data transfer, the master DSLU must derive its timing from the circuit to which it is
connected.
A Point to Point link requires two DSLUs, one master and one slave.
A Point to Multipoint link can have up to four DSLUs, one master and up to three slaves.
The DSLU at one end of the digital section is selected to be a Master (ELU), the remote end(s) are
selected to be slave(s) (NTUs).
For a tandem section, the DSLU connected to the tandem section is configured as the master.
Please refer to the diagrams on the following pages.